... UPS) is a technically-modified new product of the company on the basis of the previous UPS-500VA... 1. ApplicationBack-up ... UPS is a technically-modified new product of the company on the basis of the previousUPS-500VA one and has ... automatic voltage regulation of local electricity,sychronous switches for users load,protections of over-voltage,overvoltage,overcurrent,over-charge of batterise,feed and ...